CVE-2021-42554 is a high-severity SMM memory corruption vulnerability affecting Insyde InsydeH2O firmware kernels across multiple versions, impacting products from vendors like Insyde and Siemens. This flaw allows an attacker with high privileges to write predictable data to SMRAM, potentially escalating privileges to SMM. With a CVSS score of 8.2 (High), the vulnerability has a local attack vector and low attack complexity, leading to high impacts on confidentiality, integrity, and availability. While there is no known active exploitation or public exploit code, the vulnerability has garnered some community discussion and media coverage, indicating awareness within the cybersecurity landscape.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 5.0, < 5.08.42CPE matchmatch criteria | cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:* | ||
>= 5.1, < 5.16.42CPE matchmatch criteria | cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:* | ||
>= 5.2, < 5.26.42CPE matchmatch criteria | cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:* | ||
>= 5.3, < 5.35.42CPE matchmatch criteria | cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:* | ||
>= 5.4, < 5.42.51CPE matchmatch criteria | cpe:2.3:a:insyde:insydeh2o:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.